EP3973103A1 - Formulation pour des applications de presse encolleuse - Google Patents

Formulation pour des applications de presse encolleuse

Info

Publication number
EP3973103A1
EP3973103A1 EP20722022.9A EP20722022A EP3973103A1 EP 3973103 A1 EP3973103 A1 EP 3973103A1 EP 20722022 A EP20722022 A EP 20722022A EP 3973103 A1 EP3973103 A1 EP 3973103A1
Authority
EP
European Patent Office
Prior art keywords
composition
paper
surfactant
strength
press roll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20722022.9A
Other languages
German (de)
English (en)
Inventor
David J. CASTRO
Victor Fuk-Pong Man
Stephen Raye MARROU
Gang Pu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ecolab USA Inc
Original Assignee
Ecolab USA Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ecolab USA Inc filed Critical Ecolab USA Inc
Publication of EP3973103A1 publication Critical patent/EP3973103A1/fr
Pending legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/32—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming a linkage containing silicon in the main chain of the macromolecule
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54—Starch
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/18—Reinforcing agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/18—Reinforcing agents
    • D21H21/20—Wet strength agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/22—Agents rendering paper porous, absorbent or bulky
    • D21H21/24—Surfactants

Definitions

  • the present disclosure generally relates to formulations for the treatment of substrates. More particularly, the disclosure relates to size press formulations and methods of treating paper using the size press formulations.
  • a spray size press attempts to minimize the wear and tear traditionally associated with metered size presses by bypassing the 'metering' of a film on the press roll. Instead, the spray size press requires the formulation to be sprayed onto the coating roll a very short time before it is pressed against the paper.
  • sizing is the treatment of paper which gives it resistance to the penetration of liquids (particularly water) or vapors. Sizing agents can be applied internally through the wet end or on the surface as part of a size press formulation.
  • the strength of paper products is a property having three categories, referred to as dry strength, wet strength or rewetted strength, and wet web strength.
  • Dry strength is the strength exhibited by the dry paper sheet, typically conditioned under constant humidity and room temperature prior to testing.
  • Wet strength, or rewetted strength is the strength exhibited by a paper sheet that has been fully dried and then rewetted with water prior to testing.
  • Wet web strength is strength of a cellulosic fiber mat prior to drying to a paper product.
  • Strength agents are compositions of matter effective at increasing one or more of these strength properties.
  • a method of treating paper may include applying a composition onto a paper press roll to form a coated paper press roll, the composition comprising a strength agent, a sizing agent, and a surfactant; and contacting paper with the coated paper press roll to form a treated paper.
  • the treated paper may have a Cobb value equal to or less than a Cobb value of paper treated with the strength agent and the sizing agent but not with the surfactant.
  • the composition may be sprayed onto the paper press roll.
  • the surfactant comprises formula I:
  • the surfactant may be selected from the group consisting of a polyether polysiloxane, an alkoxylated ethylenediamine, and any combination thereof.
  • the surfactant may be any surfactant. [0010] In some aspects, the surfactant may be any surfactant.
  • the treated paper may have a Cobb value at least about 10 percent less than the Cobb value of a paper treated with the strength agent and the sizing agent but not with the surfactant.
  • a method of treating paper may include applying a composition onto a paper press roll to form a coated paper press roll, the composition comprising a strength agent and a surfactant; and contacting paper with the coated paper press roll to form a treated paper.
  • the treated paper may have a tensile strength value greater than a tensile strength value of paper treated with the strength agent but not with the surfactant.
  • a paper coating composition is provided.
  • the composition may include a strength agent; and a surfactant.
  • composition may be at least about 5 percent less than a composition comprising the strength agent but not the surfactant.
  • the surfactant may be non-ionic.
  • the surfactant comprises formula II:
  • n may be an integer ranging from 0 to 100; and Ri is hydrogen, halogen, CM O alkyl, phenyl, or cycloalkyl.
  • the surfactant may be ethylenediamine
  • the alkoxylated ethylenediamine may have a molecular weight of about 3,000 Da to about 5,000 Da.
  • the strength agent may be selected from the group consisting of an anionic starch, non-ionic starch, amphoteric starch, and any combination thereof.
  • the composition may include a colorant.
  • the composition may include about 2 wt% to about
  • a paper coating composition may include a sizing agent; and a surfactant.
  • the composition may have a contact angle on a the surface of the size press roll of at least about 15 percent less than a composition comprising the sizing agent but not the surfactant, or a surface tension of the composition may be at least about 5 percent less than a composition comprising the sizing agent but not the surfactant.
  • a paper press roll comprising the any of the compositions described herein is provided.
  • a method of treating paper is also provided.
  • the method may include applying any of the compositions described herein onto a paper press roll to form a coated paper press roll; and contacting paper with the coated paper press roll.
  • a paper coating composition may include a strength agent; a sizing agent; and a surfactant.
  • composition may be at least about 5 percent less than a composition comprising the strength agent and the sizing agent but not the surfactant.
  • a paper coating composition may include a strength agent and a surfactant.
  • the composition may optionally include a sizing agent, a colorant, or other component.
  • the paper coating composition may consist of a strength agent, a surfactant, and water.
  • the composition may exclude a sizing agent, a colorant, or other component.
  • the paper coating composition may consist essentially of a strength agent, a surfactant, and water, thereby excluding any additional component that may affect the basic and novel properties of the composition.
  • a basic and novel property of the compositions disclosed herein is the reduction in surface tension when a surfactant is present compared to a composition without a surfactant.
  • a paper coating composition may include a sizing agent and a surfactant.
  • the composition may optionally include a strength agent, a colorant, or other component.
  • the paper coating composition may consist of a sizing agent, a surfactant, and water.
  • the composition may exclude a strength agent, a colorant, or other component.
  • the paper coating composition may consist essentially of a sizing agent, a surfactant, and water, thereby excluding any additional component that may affect the basic and novel properties of the composition.
  • a paper coating composition may include a strength agent, a sizing agent, and a surfactant.
  • the composition may optionally include a colorant or other component.
  • the amount of surfactant on the paper is less than about 0.03 percent by weight.
  • the paper coating composition may consist of a strength agent, a sizing agent, a surfactant, and water.
  • the composition may exclude a colorant or other component.
  • the paper coating composition may consist essentially of strength agent, a sizing agent, a surfactant, and water, thereby excluding any additional component that may affect the basic and novel properties of the composition.
  • a paper coating composition may include a strength agent, a sizing agent, a colorant, and a surfactant.
  • the composition may optionally include other components.
  • the paper coating composition may consist of a strength agent, a sizing agent, a colorant, a surfactant, and water.
  • the composition may exclude other components.
  • the paper coating composition may consist essentially of strength agent, a sizing agent, a surfactant, a colorant, and water, thereby excluding any additional component that may affect the basic and novel properties of the composition.
  • the compositions disclosed herein may be an aqueous solution. In some aspect, the composition may or may not be an emulsion or a dispersion.
  • compositions disclosed herein may be sprayable.
  • a sprayable composition is advantageous for use in a spray size press where the formulation is sprayed onto the coating roll a very short time before the coating roll is pressed against the paper.
  • the pH of the paper coating compositions is not particularly limited to any specific pH or pH range. In some aspects, the pH of the composition may be from about 3 to about 8.
  • the surface tension of the composition may be at least about 5 percent less than a composition comprising the strength agent but not the surfactant. In some aspects, the surface tension of the composition may be at least about 5 percent less than a composition comprising the sizing agent but not the surfactant. In some aspects, the surface tension of the composition may be at least about 5 percent less than a composition comprising the strength agent and the sizing agent but not the surfactant.
  • the surface tension of the composition may be about 5 percent to about 90 percent less than a composition having the same components except for the surfactant. In some aspects, the surface tension of the composition may be about 5 percent to about 90 percent less, about 10 percent to 90 percent less, about 20 percent to 90 percent less, about 10 percent to about 80 percent less, about 10 percent to about 70 percent less, or about 20 percent to about 70 percent less than a composition having the same components except for the surfactant. In some aspects, the surface tension of the composition may decrease by about 10 percent, about 20 percent, about 30 percent, about 40 percent, about 50 percent, about 60 percent, or about 70 percent when a surfactant is added to the composition.
  • the surface tension may be determined using known techniques in the art.
  • the surface tension may be determined using a
  • the contact angle of a liquid drop against a surface is defined as the angle formed by two lines: the solid surface and a tangent to the liquid drop that intersects the point where the liquid, solid and air interfaces meet. The lower the contact angle is, the higher the affinity of the droplet for the surface and the greater the wettability.
  • the composition may have a contact angle on a roll surface of at least about 15 percent less than a composition without the surfactant.
  • the composition may have a contact angle on a roll surface of about 15 percent to about 60 percent less, about 20 percent to about 60 percent less, or about 20 percent to about 50 percent less than a composition without the surfactant.
  • the contact angle may be measured using methods known to one of ordinary skill in the art such as, for example, image analysis techniques.
  • compositions disclosed herein may include a surfactant.
  • surfactant includes anionic, nonionic, cationic, amphoteric, and zwitterionic surfactants.
  • the surfactant may be non-ionic.
  • the surfactant may be a polyether polysiloxane.
  • a polyether polysiloxane may have the chemical structure of formula I.
  • n may be 1 to 50, 1 to 20, or 1 to 10. In some aspects, n may be 1. In some aspects, m may be 0 to 50, 0 to 20, or 0 to 10.
  • m may be 0.
  • x may be 1 and y may be 0.
  • Ri may be hydrogen, halogen, or CM O alkyl. In some aspects, Ri may be methyl.
  • alkyl refers to a linear or branched hydrocarbon radical, preferably having 1 to 10 carbon atoms (i.e. , 1 , 2, 3, 4, 5, 6, 7, 8, 9, or 10 carbons).
  • Alkyl groups include, but are not limited to, methyl, ethyl, propyl (e.g., n-propyl, isopropyl), butyl (e.g., n-butyl, isobutyl, tert-butyl, sec-butyl), pentyl ( e.g., n-pentyl, isopentyl, tert-pentyl, neopentyl, sec-pentyl, 3-pentyl), hexyl, heptyl, octyl, nonyl, and decyl. Alkyl groups may be unsubstituted or substituted by one or more suitable substituents.
  • cycloalkyl refers to a mono, bicyclic or tricyclic carbocyclic radical (e.g., cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclopentenyl, cyclohexenyl, bicyclo[2.2.1 ]heptanyl, bicyclo[3.2.l]octanyl and bicyclo[5.2.0]nonanyl, etc.); optionally containing 1 or 2 double bonds. Cycloalkyl groups may be unsubstituted or substituted by one or more suitable substituents.
  • the surfactant comprises formula II:
  • the surfactant comprises formula III:
  • the surfactant may be an alkoxylated
  • ethylenediamine such as, for example, ethylenediamine tetrakis(ethoxylate- block-propoxylate) tetrol.
  • the alkoxylated ethylenediamine may have a molecular weight of about 3,000 Da to about 5,000 Da.
  • compositions disclosed herein may include from about 0.005 wt% to about 0.5 wt% of the surfactant. In some aspects, the composition may include from about 0.0001 wt% to about 1 wt% of the surfactant. In some aspects, the composition may include about 0.01 wt%, about 0.02 wt%, about 0.03 wt%, or about 0.1 wt% of the surfactant.
  • Suitable strength agents may include but are not limited to natural polymers, such as starch, carboxymethyl cellulose (CMC), xanthan gum and guar gum.
  • Suitable strength agents may include but are not limited to synthetic polymers, such as polyacrylamide (cationic, anionic and
  • GPAM glyoxalated polyacrylamide
  • polyamidoamine epihalohydrin-based polymers polyvinylamines.
  • the starch may, for example, be anionic, cationic, non-ionic or amphoteric starch, particularly anionic, non-ionic or amphoteric starch, from various plants, including corn, potato, wheat, tapioca, or sorghum, optionally modified by enzymes, high temperature or
  • the starch may include: natural starch, modified starch, amylase, amylopectin, styrene-starch, butadiene starch, starches containing various amounts of amylase and amylopectin, such as 25% amylase and 75% amylopectin (corn starch) and 20% amylase and 80% amylopectin (potato starch); enzymatically treated starches; hydrolyzed starches; heated starches, also known in the art as "pasted starches”; cationic starches, such as those resulting from the reaction of a starch with a tertiary amine to form a quaternary ammonium salt; non-ionic starches; anionic starches; amphoteric starches (containing both cationic and anionic functionalities); cellulose and cellulose derived compounds; and any combination thereof and/or
  • the composition may have about 1 wt% to about 20 wt%, about 1 wt% to about 15 wt%, about 1 wt% to about 10 wt%, or about 1 wt% to about 5 wt% of the strength agent. In some aspects, the composition may have about 2 wt%, about 3 wt%, about 4 wt%, about 5 wt%, about 6 wt%, about 7 wt%, about 8 wt%, about 9 wt%, or about 10 wt% of the strength agent.
  • the composition may have about 1 wt% to about 20 wt%, about 1 wt% to about 15 wt%, about 1 wt% to about 10 wt%, or about 1 wt% to about 5 wt% of a non-ionic starch.
  • Suitable sizing agents include but are not limited to rosin size and water-insoluble hydrophobic cellulose-sizing agents, such as alkyl ketene dimer (“AKD”), alkenyl succinic anhydride (ASA), styrene acrylic acid (SAA) emulsions, styrene acrylate emulsions (SAE), styrene maleic anhydride (SMA) emulsions, ethylene acrylic acid (EAA), polyurethane, and mixtures thereof.
  • the sizing agent may be Perglutin 400.
  • Suitable colorants may include but are not limited to organic compounds having conjugated double bond systems; azo compounds;
  • metallic azo compounds metallic azo compounds; anthraquinones; triaryl compounds, such as triarylmethane; quinoline and related compounds; acidic dyes (anionic organic dyes containing sulfonate groups, used with organic rations such as alum); basic dyes (cationic organic dyes containing amine functional groups); and direct dyes (acid-type dyes having high molecular weights and a specific, direct affinity for cellulose); as well as combinations of the above-listed suitable dye compounds.
  • acidic dyes anionic organic dyes containing sulfonate groups, used with organic rations such as alum
  • basic dyes cationic organic dyes containing amine functional groups
  • direct dyes as well as combinations of the above-listed suitable dye compounds.
  • the colorant may be Cartasol Brown.
  • compositions may include various components. Further, the formulation may be aqueous-based, hydrocarbon based, organic solvent based, emulsion based (water-in-oil, oil-in-water), etc.
  • Other components may include but are not limited to optical brightening agents, biocides, retention aids, defoamers, pH control agents, pitch control agents, and drainage aids.
  • a component may be a polyaluminum chloride (PAC) compound.
  • PAC polyaluminum chloride
  • Any PAC may be used in accordance with the present disclosure.
  • the PAC is selected from the group consisting of
  • the PAC is phosphated polyaluminum chloride.
  • any composition disclosed herein may be disposed on the surface of a paper press roll.
  • the paper press roll may be a sizing press roll.
  • the composition may be disposed over at least a portion of the surface of the roll.
  • the composition may be sprayed over the entire surface of the sizing press roll.
  • the composition may be sprayed over at least a portion of the surface of the sizing press roll.
  • a method of treating paper is provided.
  • the method may include applying any composition disclosed herein onto a paper press roll to form a coated paper press roll and contacting paper with the coated paper press roll.
  • compositions may be applied separately in separate compositions onto the paper press roll.
  • a composition comprising a strength agent and a surfactant may be sprayed onto the roll separately from a composition comprising a sizing agent and a surfactant.
  • Properties of the treated paper may be enhanced when a surfactant is included in the paper coating composition.
  • the surfactant may enhance the effects of strength agents in the composition. Without being bound by any particular theory, the surfactant allows the strength agent to penetrate the paper thereby imparting improved bulk strength characteristics.
  • the treated paper may have a Cobb value equal to or less than a Cobb value of paper treated with the strength agent or sizing agent but not with the surfactant. In some aspects, the treated paper may have a Cobb value equal to or less than a Cobb value of paper treated with the strength agent and the sizing agent but not with the surfactant.
  • the treated paper may have a Cobb value of about 5 percent to about 40 percent less, about 5 percent to about 30 percent less, about 10 percent to about 30 percent less, or about 10 percent to about 20 percent less than the Cobb value of a paper treated with the strength agent or sizing agent but not with the surfactant.
  • the treated paper may have increased bulk strength properties, such as short span compression test (SCT) strength, tensile strength, Concora fluted edge crush (CFC) strength, ring crush strength, and burst strength, than paper treated with the strength agent but not with the surfactant.
  • SCT short span compression test
  • CFC Concora fluted edge crush
  • ring crush strength ring crush strength
  • burst strength may be measured by any technique known to one of ordinary skill in the art.
  • SCT may be measured as defined in TAPPI Method T826 om-04; tensile strength may be measured as defined in TAPPI Method T494 om-13; CFC may be measured as defined in TAPPI Method T843 om-02; ring crush strength may be measured as defined in TAPPI Method T822 om-02; and burst strength may be measured as defined in TAPPI Method T403 om-02.
  • the treated paper may have a tensile strength value greater than a tensile strength value of paper treated with the strength agent but not with the surfactant.
  • a bulk strength property may increase by at least about 5 percent, at least about 10 percent, at least about 15 percent, or at least about 20 percent.
  • the SCT strength may increase by at least about 5 percent, at least about 10 percent, at least about 15 percent, or at least about 20 percent.
  • the tensile strength may increase by at least about 5 percent, at least about 10 percent, at least about 15 percent, or at least about 20 percent.
  • the CFC strength may increase by at least about 5 percent, at least about 10 percent, at least about 15 percent, or at least about 20 percent.
  • the ring crush strength may increase by at least about 5 percent, at least about 10 percent, at least about 15 percent, or at least about 20 percent.
  • the burst strength may increase by at least about 5 percent, at least about 10 percent, at least about 15 percent, or at least about 20 percent.
  • two or more bulk strength properties may increase by at least about 5 percent, at least about 10 percent, at least about 15 percent, or at least about 20 percent.
  • the burst strength and SCT may increase by at least about 5 percent, at least about 10 percent, at least about 15 percent, or at least about 20 percent.
  • the CFC strength and SCT strength may increase by at least about 5 percent, at least about 10 percent, at least about 15 percent, or at least about 20 percent.
  • the composition may be sprayed onto the paper press roll.
  • Papermaking typically includes a pulping stage, a bleaching stage, a stock preparation stage, a wet end stage, and a dry end stage.
  • the pulping stage individual cellulose fibers are liberated from a source of cellulose by mechanical and/or chemical action.
  • the pulp is suspended in water in the stock preparation stage.
  • the wet end stage of the papermaking process comprises depositing the stock suspension or pulp slurry on the wire or felt of the papermaking machine to form a continuous web of fibers, draining of the web, and consolidation of the web (“pressing”) to form a sheet.
  • the web is dried and may be subjected to additional processing like passing it through a size press, calendering, spray coating with surface modifiers, printing, cutting, corrugating and the like.
  • the dried paper can be treated by spray coating using a sprayboom.
  • Dry End means that portion of the papermaking process including and subsequent to a press section where a liquid medium such as water typically comprises less than 45% of the mass of the substrate, dry end includes but is not limited to the size press portion of a papermaking process, additives added in a dry end typically remain in a distinct coating layer outside of the slurry.
  • the present disclosure contemplates using a paper coating composition in one or more stages of the papermaking process described above.
  • a typical papermaking machine includes components such as a dryer, a calendering system, and a surface sizing system.
  • the surface sizing system may comprise a size press which applies sizing agents or other compounds, such as optical brightening agents, to the surface of the paper.
  • a size press applies various solutions or formulations to the surface of paper.
  • the paper may have been dried or partially dried before treatment by the size press.
  • the paper coating composition may be applied to the paper substrate as a surface treatment.
  • the composition may be applied to one side of the paper or both sides of the paper.
  • the paper substrate on which the composition is applied is not creped paper.
  • the paper coating composition may be applied at or near the size press, although the composition can certainly be applied at other locations in the papermaking process.
  • the size press is situated downstream of a first drying section.
  • the composition may be applied using conventional size presses, although other components / techniques (e.g. spraying, doctor bar, or other conventionally used coating equipment) may be used to apply the composition.
  • application of chemicals at, near, or after the size press may be differentiated from application of chemicals at the wet end of the papermaking machine. One difference relates to the fact that the paper is dried, or at least partially dried, before it arrives at the size press.
  • A-K Tegopren 5840
  • B Silwet L-77
  • C Plurafac RA 300
  • D Dow Corning 502W
  • E Pluronic 31 R1
  • F Tetronic 701
  • G Tetronic 901
  • H Airase 5600
  • I
  • Surfactants A, B, D, and K are considered to be superwetters.
  • Surfactants E, F, and G are defoamers.
  • Surfanctants H and I are silicone defoamers.
  • Surfactant J is a silicone glycol copolymer and surfactant C is a low foam wetter.
  • Study 2 demonstrates the sensitivity of the surface tension of starch solutions to the presence of the surfactant without and with the surface size agent and dye.
  • Table 4 summarizes the results, where surfactants B and G were dosed in the 0-300 ppm and 0-200 ppm range. In each case, a reduction of about 10 mN/m in surface tension was observed when 200 ppm are dosed.
  • solution viscosity is an important parameter: high viscosities limit solution transfer to the paper, thereby negatively affecting the overall production rate.
  • Table 5 below shows that the effect of up to 100 pm surfactant in coating solutions has a negligible effect on viscosity.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)

Abstract

L'invention concerne des compositions de traitement de papier et des procédés d'utilisation de celles-ci. Les compositions de traitement de papier de la présente invention peuvent comprendre un agent de résistance et un tensioactif ou un agent d'encollage et un tensioactif. Les compositions et les procédés peuvent être utilisés pour améliorer l'encollage et la résistance du papier, en particulier, par exemple dans des applications de presse encolleuse à pulvérisation.
EP20722022.9A 2019-05-20 2020-03-31 Formulation pour des applications de presse encolleuse Pending EP3973103A1 (fr)

Applications Claiming Priority (2)

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US201962850267P 2019-05-20 2019-05-20
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US20220205185A1 (en) 2022-06-30

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